# Molecular Insights into the Incorporation of Platinum-Based Drugs into Lipid Aggregates

## TL;DR

This study explores how attaching fatty acids to platinum chemotherapy drugs improves their compatibility with lipid delivery systems, using molecular simulations to understand how these drug-lipid mixtures form.

## Contribution

The study introduces a molecular-level analysis of how fatty acid–platinum conjugates interact with phospholipids to form lipid aggregates.

## Key findings

- Lipid–drug mixtures spontaneously form micelle-like aggregates driven by hydrophobic interactions.
- Aggregation dynamics vary based on the hydrophobic chain length and unsaturation of fatty acid conjugates.
- Structural modifications of fatty acid–platinum conjugates can enhance their incorporation into lipid-based systems.

## Abstract

Platinum-based (Pt-based) compounds remain a cornerstone
of chemotherapy,
yet their clinical use is limited mainly due to poor tumor specificity
and systemic toxicities. Fatty acid conjugation has emerged as a promising
strategy to overcome the limitations of conventional platinum drugs
by enhancing lipophilicity, improving cellular uptake, and potentially
acting as prodrugs with altered physicochemical properties and binding
kinetics to biomolecular targets. The covalent conjugation of lipophilic
fatty acids also improves the compatibility of Pt-based compounds
with lipid-based delivery systems, facilitating their incorporation.
In this study, we employed atomistic molecular dynamics (MD) simulations
to investigate the interactions between a series of Pt-based compounds,
including cisplatin and fatty acid–conjugated analogs (CapryP,
ArP, SteariP, ElaidP, and OleP), and biologically relevant phospholipids
(DOPC, DSPE, and DPPG). Simulations revealed the spontaneous self-assembly
of lipid–drug mixtures into micelle-like aggregates, driven
by hydrophobic interactions and modulated by the chemical structure
of the conjugated moieties. Cluster analysis demonstrated variation
in aggregation dynamics among the compounds, with hydrophobic chain
length and unsaturation degree influencing the rate and stability
of complex formation. These findings provide insights at the molecular-level,
shedding light into the molecular attributes that govern the incorporation
of fatty acid–Pt-based conjugates into lipid assemblies, highlighting
the potential of structural modifications to enhance their delivery
within lipid-based systems.